Conclusions

From John Boyce Bennett’s 1980 logic textbook Rational Thinking:

If it’s false that no dopips are fraks, characterize each of these propositions as true, false, or doubtful:

a. All dopips are fraks.
b. Few dopips are fraks.
c. Some dopips are fraks.
d. No fraks are dopips.
e. Some dopips are not fraks.

	Select Click for Answer
If it’s false that no dopips are fraks, then some dopips are fraks, so c is true. That in turn makes d false and the other statements doubtful.